docs: def com_google_fonts_check_metadata_valid_copyright(font_metadata):
    """Copyright notices match canonical pattern in METADATA.pb"""
    import re
    string = font_metadata.copyright
    does_match = re.search(r'Copyright [0-9]{4} The .* Project Authors \([^\@]*\)',
                             string)
    if does_match:
      yield PASS, "METADATA.pb copyright string is good"
    else:
      yield FAIL, ("METADATA.pb: Copyright notices should match"
                   " a pattern similar to:"
                   " 'Copyright 2017 The Familyname"
                   " Project Authors (git url)'\n"
                   "But instead we have got:"
                   " '{}'").format(string)